Oceans

What do ship captains use to help them know when it is safe to dock at the ocean's edge?

More Questions from Oceans
Which of the following is a unique characteristic of minke whales?
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The 'Bering Strait' is a piece of the Pacific ocean that divides which of these two countries?
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Which of these is the smallest of the world's oceans?
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Of all marine crustaceans caught by humans each year, crabs make up what percent?
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Which state, although widely known for seafood, only has eight miles of Atlantic Ocean coastline?
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What instrument uses sound waves to help get a picture of the ocean's bottom?
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Which U.S. State is located closest to the Atlantic Ocean?
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Besides Greenland, what is the largest island in the Atlantic Ocean?
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